Question

3) Solve this system of linear equations by elimination.

Answer 1

Answer:

Solving this system of linear equations by elimination we get x=-1 and y=-2

Option 1 is correct option.

Step-by-step explanation:

We are given equations:

$y=x-1---eq(1)\\2x-y=0---eq(2)$

We need to solve by Elimination method.

Elimination method: Add or subtract the equations to get an equation in one variable.

Rearranging the equation 1 we get

$-x+y=-1---eq(1)\\2x-y=0---eq(2)$

Add eq(1) and eq(2)

$-x+y=-1\\2x-y=0\\------\\x=-1$

So, after eliminating y we get x=-1

Now finding y by putting x in eq(1)

$y=x-1\\y=-1-1\\y=-2$

We get y=-2

So, solving this system of linear equations by elimination we get x=-1 and y=-2

Option 1 is correct option.